DVCS is the simplest probe of a new class
of light-cone (quark) matrix elements, called
Generalized Parton Distributions (GPDs). The GPDs offer the
exciting possibility of the first ever spatial images of the
quark waves inside the proton, as a function of their wavelength [1]}, [2]}, [3]}, [4]}, [5]}, [6]}.
The correlation of transverse spatial and longitudinal momentum
information contained in the GPDs provides a new tool
to evaluate the contribution of quark orbital angular momentum
to the proton spin.
